Why does dbt enforce that model contracts must have unique column names, and what happens if duplicate column names are present?

hard🧠 Conceptual Q10 of 15

dbt - Governance and Collaboration

ADuplicate column names are merged automatically by dbt without errors.

BUnique column names ensure clear schema validation; duplicates cause contract validation failure.

Cdbt ignores duplicates and validates only the first occurrence.

DDuplicate columns are allowed if types match exactly.

Step-by-Step Solution

Solution:

Step 1: Understand schema validation requirements
Unique column names are necessary to clearly validate each column's type and constraints.
Step 2: Effect of duplicates
Duplicate column names cause ambiguity and lead to contract validation failure to prevent errors.
Final Answer:
Unique column names ensure clear schema validation; duplicates cause contract validation failure. -> Option B
Quick Check:
Unique columns required; duplicates cause failure = A [OK]

Quick Trick: Contracts require unique column names to avoid validation errors [OK]

Common Mistakes:

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